GeomGridEval_BSplineSurface Class Reference

Efficient batch evaluator for B-spline surface points. More...

#include <GeomGridEval_BSplineSurface.hxx>

Public Member Functions
	GeomGridEval_BSplineSurface (const occ::handle< Geom_BSplineSurface > &theSurface)
	Constructor with geometry.
	GeomGridEval_BSplineSurface (const GeomGridEval_BSplineSurface &)=delete
	Non-copyable and non-movable.
GeomGridEval_BSplineSurface &	operator= (const GeomGridEval_BSplineSurface &)=delete
	GeomGridEval_BSplineSurface (GeomGridEval_BSplineSurface &&)=delete
GeomGridEval_BSplineSurface &	operator= (GeomGridEval_BSplineSurface &&)=delete
const occ::handle< Geom_BSplineSurface > &	Geometry () const
	Returns the geometry handle.
NCollection_Array2< gp_Pnt >	EvaluateGrid (const NCollection_Array1< double > &theUParams, const NCollection_Array1< double > &theVParams) const
	Evaluate grid points at Cartesian product of U and V parameters. Points are evaluated in span-grouped order to minimize cache rebuilds.
NCollection_Array2< GeomGridEval::SurfD1 >	EvaluateGridD1 (const NCollection_Array1< double > &theUParams, const NCollection_Array1< double > &theVParams) const
	Evaluate grid points with first partial derivatives.
NCollection_Array2< GeomGridEval::SurfD2 >	EvaluateGridD2 (const NCollection_Array1< double > &theUParams, const NCollection_Array1< double > &theVParams) const
	Evaluate grid points with first and second partial derivatives.
NCollection_Array2< GeomGridEval::SurfD3 >	EvaluateGridD3 (const NCollection_Array1< double > &theUParams, const NCollection_Array1< double > &theVParams) const
	Evaluate grid points with derivatives up to third order. Uses direct BSplSLib::D3 evaluation (no caching for D3).
NCollection_Array2< gp_Vec >	EvaluateGridDN (const NCollection_Array1< double > &theUParams, const NCollection_Array1< double > &theVParams, int theNU, int theNV) const
	Evaluate partial derivative d^(NU+NV)S/(dU^NU dV^NV) at all grid points. For orders > degree in either direction, returns zero. Uses direct geometry DN method.

Detailed Description

Efficient batch evaluator for B-spline surface points.

Stateless evaluator - constructor takes geometry, parameters passed to methods.

Optimizes evaluation by:

• Pre-computing span indices for U and V parameters separately (O(aNbU + aNbV))
• Grouping evaluation by (USpan, VSpan) for cache-optimal iteration
• Rebuilding cache only once per span group (not per point)
• Writing results directly to 2D output grid (no intermediate buffers)

Usage:

GeomGridEval_BSplineSurface anEvaluator(myBSplineSurface);
NCollection_Array2<gp_Pnt> aGrid = anEvaluator.EvaluateGrid(myUParams, myVParams);

Constructor & Destructor Documentation

GeomGridEval_BSplineSurface() [1/3]

GeomGridEval_BSplineSurface::GeomGridEval_BSplineSurface ( const occ::handle< Geom_BSplineSurface > & theSurface )

inline

Constructor with geometry.

Parameters

theSurface

the B-spline surface to evaluate

GeomGridEval_BSplineSurface() [2/3]

GeomGridEval_BSplineSurface::GeomGridEval_BSplineSurface ( const GeomGridEval_BSplineSurface & )

delete

Non-copyable and non-movable.

GeomGridEval_BSplineSurface() [3/3]

GeomGridEval_BSplineSurface::GeomGridEval_BSplineSurface ( GeomGridEval_BSplineSurface && )

delete

Member Function Documentation

EvaluateGrid()

NCollection_Array2< gp_Pnt > GeomGridEval_BSplineSurface::EvaluateGrid	(	const NCollection_Array1< double > &	theUParams,
		const NCollection_Array1< double > &	theVParams ) const

Evaluate grid points at Cartesian product of U and V parameters. Points are evaluated in span-grouped order to minimize cache rebuilds.

Parameters

theUParams	array of U parameter values
theVParams	array of V parameter values

Returns

2D array of evaluated points (1-based indexing), or empty array if geometry is null or parameters empty

EvaluateGridD1()

NCollection_Array2< GeomGridEval::SurfD1 > GeomGridEval_BSplineSurface::EvaluateGridD1	(	const NCollection_Array1< double > &	theUParams,
		const NCollection_Array1< double > &	theVParams ) const

Evaluate grid points with first partial derivatives.

Parameters

theUParams	array of U parameter values
theVParams	array of V parameter values

Returns

2D array of SurfD1 (1-based indexing), or empty array if geometry is null or parameters empty

EvaluateGridD2()

NCollection_Array2< GeomGridEval::SurfD2 > GeomGridEval_BSplineSurface::EvaluateGridD2	(	const NCollection_Array1< double > &	theUParams,
		const NCollection_Array1< double > &	theVParams ) const

Evaluate grid points with first and second partial derivatives.

Parameters

theUParams	array of U parameter values
theVParams	array of V parameter values

Returns

2D array of SurfD2 (1-based indexing), or empty array if geometry is null or parameters empty

EvaluateGridD3()

NCollection_Array2< GeomGridEval::SurfD3 > GeomGridEval_BSplineSurface::EvaluateGridD3	(	const NCollection_Array1< double > &	theUParams,
		const NCollection_Array1< double > &	theVParams ) const

Evaluate grid points with derivatives up to third order. Uses direct BSplSLib::D3 evaluation (no caching for D3).

Parameters

theUParams	array of U parameter values
theVParams	array of V parameter values

Returns

2D array of SurfD3 (1-based indexing), or empty array if geometry is null or parameters empty

EvaluateGridDN()

NCollection_Array2< gp_Vec > GeomGridEval_BSplineSurface::EvaluateGridDN	(	const NCollection_Array1< double > &	theUParams,
		const NCollection_Array1< double > &	theVParams,
		int	theNU,
		int	theNV ) const

Evaluate partial derivative d^(NU+NV)S/(dU^NU dV^NV) at all grid points. For orders > degree in either direction, returns zero. Uses direct geometry DN method.

Parameters

theUParams	array of U parameter values
theVParams	array of V parameter values
theNU	derivative order in U direction
theNV	derivative order in V direction

Returns

2D array of derivative vectors (1-based indexing)

Geometry()

const occ::handle< Geom_BSplineSurface > & GeomGridEval_BSplineSurface::Geometry ( ) const

inline

Returns the geometry handle.

operator=() [1/2]

GeomGridEval_BSplineSurface & GeomGridEval_BSplineSurface::operator= ( const GeomGridEval_BSplineSurface & )

delete

operator=() [2/2]

GeomGridEval_BSplineSurface & GeomGridEval_BSplineSurface::operator= ( GeomGridEval_BSplineSurface && )

delete

---

The documentation for this class was generated from the following file:

• GeomGridEval_BSplineSurface.hxx